The scope has an externally and internally mounted factory matched tunable etalon system for use at both <0.8 Angtroms and <0.55 Angstroms. The optical system has been optimized for the Hydrogen-alpha wavelength. The Double Stack System.. ... Learn More

The scope has an externally and internally mounted factory matched tunable etalon system for use at both <0.8 Angtroms and <0.55 Angstroms. The optical system has been optimized for the Hydrogen-alpha wavelength. The Double Stack System.. ... Learn More